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某小区内供热管道于竣工使用至第三个采暖期时,发现管道出现漏水问题;第四个采暖期供热试水时,又发现多处漏水,对正常供热产生严重影响,不得不对区内管道挖开进行检查维修。管道挖开后,经检查发现管道渗漏点全部出现在管道的焊接接头处,主要因管道电弧焊接质量差;部分问题点甚至出现焊接后药皮未清除的现象,使局部处于假焊状态,且接头多数未做防腐和保温处理,或防腐和保温不到位就直埋于土中。检查中还发现,有一处由于焊接时因电弧接地线打铁造成咬伤而导致的喷漏,
During the heating period of a residential district heating pipe to the third heating period, it was found that there was a water leakage problem in the pipeline. In the fourth heating period, multiple leaks were found during heating test, which had a serious impact on the normal heating. Excavation of the district pipeline inspection and maintenance. After digging the pipe, it was found through inspection that all the pipe leakage occurred at the pipe joints, mainly due to the poor quality of the pipe arc welding; some problems even appeared after welding the skin is not cleared phenomenon, so that the local in the false welding state, And the majority of joints without preservative and heat treatment, or corrosion and insulation is not in place directly buried in the soil. Inspection also found that there is a due to welding arc grounding wire caused by biting caused by leakage,